Senior Software Engineer (Fullstack) - Merchant EMEA

London · Berlin · Helsinki, Finland · Full-time · Hybrid · Posted Sep 28, 2026

At a glance

Merchant EMEA Engineering builds the technology that helps merchants join, grow, and operate successfully across markets.
As a Fullstack Engineer, you'll contribute to products and services used across the merchant experience.
You will build products and features on top of existing platforms to solve real merchant and market needs, including local business requirements, growth opportunities, and operational challenges.

Build and maintain production software across backend services and user-facing applications.
Work on areas such as merchant onboarding, analytics, recommendations, menu and order management, integrations, or merchant-facing tools.
Develop reliable APIs, data models, services, and user-facing features.
Collaborate closely with product managers, designers, operations, and other engineers to turn business needs into practical technical solutions.
Own features from implementation through production and ongoing maintenance.
Contribute to technical design discussions and improve the quality, scalability, observability, and maintainability of our systems.
Use AI-assisted development tools effectively as part of your engineering workflow, while critically evaluating their output and taking ownership of the final solution.
Be willing to work outside your primary area of expertise when needed to solve the problem end-to-end.

An AI-first mindset, with a deep experience in leveraging modern AI tools and solid engineering principles to solve problems end-to-end, independently of any specific technology stack.
Proven experience building production software in backend, frontend, or fullstack environments end-to-end and at scale.
Strong expertise in at least one area of the stack, with a willingness to contribute outside that area when needed.
Experience with a modern backend language such as Go, Kotlin, Java, or similar, and/or modern frontend technologies such as TypeScript and React.
Good understanding of APIs, databases, testing, and software design fundamentals.
The ability to work independently on well-scoped problems and collaborate effectively with others.
Good communication skills and a pragmatic, collaborative mindset.

Experience in merchant-facing or internal operational tools.
Experience in analytics, recommendations, or decisioning systems.
Experience in grocery, retail, restaurants, logistics, or marketplace technology.
Experience with integrations with external business systems.
Experience with Kafka or other streaming technologies.
Experience with cloud infrastructure such as AWS, Kubernetes, or Docker.

This open role is based in tech hubs in Helsinki or Berlin.
This role requires being based in Berlin/Helsinki on a hybrid basis.
Fully remote work, visa sponsorship, or relocation support are not offered for this opportunity.

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